“You be careful,” she says to me. “You, too,” I say. I turn and head back to the stream, feeling somehow worried. About Rue being killed, about Rue not be- ing killed and the two of us being left for last, about leaving Rue alone, about leaving Prim alone back home. No, Prim has my mother and Gale and a baker who has promised she won’t go hungry. Rue has only me.” (p.213)
This shows that Katniss and Rue are both very caring because she is Rue is telling Katniss to be careful and Katniss is trying to not worry about Prim and her family but to protect Rue for now because she only has her. This also shows that they are trusting each other and relying on each other.